I am serious now…I am a switch Guy…let me give you what I know…
Dear Porkodi ( Are you from TamilNadu ),
Lets Say :-
1 BTS with 2+2+2 Configuration.
2+2+2 Means 3 Sectors and 2 ARFCN/TRX Per Sector.
So Per Sector 2*8 Time slots.
So that BTS has 2*8*3 TimeSlots.
Total TS=48 in AIR Interface.
In each sector dedicate 2 TS For BCCH and SDDCH.
So remaining = 48-(2*3)=42 Speech TS in AIR Interface.